Whatever LRF you buy, I'd test it thoroughly. If it doesn't perform as expected, send it back. I think there is more to it than make/model. The variability from one unit to another, from the same company, can vary.
I have looked at many units from many manufacturers including sizable numbers at once and have never seen any variability within a model under identical conditions. I have seen a number of people ranging the same object at the same time and all ranges come out exactly the same after taking into account a step or two within the group.
There are people that cannot find a range standing at a tee with the description of the hole in front of them, but that ain't the LRFs fault.
